noun
workers on the job; people at work; attendees
Refers to people who have come to work or are present at their workplace, often used in contexts like attendance records or headcounts.
今日の出勤者は少なかった。
There were few people at work today.
出勤者名簿に名前を記入してください。
Please sign your name on the attendance sheet.
従業員 is a general term for 'employee', whereas 出勤者 specifically means those who are currently present at work.
Compound of 出勤 (attendance at work) + 者 (person).